Programming with Scratch?

Hello, I would like to write a program on Scratch with the following game idea:

I want to write a game that swaps mouse movements. The player must click on the dots that appear one after the other as quickly and as few errors as possible. Assuming the dot appears on the left side of the screen, the player must move the mouse to the right, which moves the mouse pointer to the left. As soon as the dot appears at the top of the screen, the mouse must be moved down to reach the dot. Up and down are swapped. Right and left are swapped. My program will then evaluate both the speed and the number of errors.

Can someone help me how to program the right/left swap and how to display the evaluation of the speed and number of errors?